CeramicSpeed Oversized Pulley Wheel System (Red) (Shimano 9100/9150 & 8000/8050)

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From Performance Bike

The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Note: The OSPW System for 9100/9150 and 8000 SS/8050 SS is NOT compatible with Ultegra 8000-GS or 8050-GS (medium cage) derailleurs, nor with the clutch equipped Ultegra RD RX800 & RX805 Features: Proven to be the fastest pulley system, chosen by many of the world's leading cycling teams and professional triathlete Optimized tooth designs offer 3-5 times longer life than standard OE pulleys Coated: metallic layer that covers bearing races making them 75% harder than steel.